Re: [whatwg/dom] Shadow: Specify when `slotchange` fires (#447)

> When firing such a slotevent at slot's removal, the slot's assigned nodes will be always empty. Is slotchange for that really a useful event for web developers? Does web developers have a clean up task at this timing, although that assigned nodes is always empty?

I think those scenarios exist, where cleanup is desirable and/or necessary. (E.g. Setting/Unsetting `aria-activedescandant`.) 

> In real worlds, does removing slots (or its one of ancestors) from the tree happen frequently? If that happens frequently and there is no use case for a slotchange event at this timing, I object to this change because the performance impact can't be ignored.

I have no hard numbers, but from experience I’d say that performance does not need to be a concern here. Removing _slots_ from a Shadow Root is pretty rare – I have never seen or done it. Maybe @sorvell or @kevinpschaaf can provide additional insight.

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